This is a very smart little bistro, nearby to Astoria, but far enough off the main drag to avoid being inundated with tourists. It has only about 10 tables and seems very popular with locals as well as a few visitors.
There's a modest (with a choice of probably 6-8 starters and main courses and 4 desserts), but excellent menu plus daily specials chalked on the board. Food is mainly Italian (with a few French influences) in style but with some interesting twists such as carpaccio of salmon with tangerine marmalade (which was very pleasant indeed though the relish was entirely unnecessary) and fettucine with langoustine and basil, which sounded most odd but worked an absolute treat. On arrival, there's an amuse-bouche -- ours was foie gras toasts.
Its ambience is all crisp white linen, soft classical music and candle-lit hush so perfect for a romantic outing. The wine list majors on Hungarian wines -- not too madly priced -- plus some more expensive imported wines. Service is unobtrusive but well judged and informed (English, French and German are spoken). This is a great find in a popular area rife with similarly priced places whose quality and service is less worthwhile – it may be quite expensive, but worth every forint.